[buzzinhalfdozen]

Adger, you are correct if a cyl. misfires it is "read" by the 02 as lean. There are a few thigs that can cause an unwanted lean condition, obviously a miss as we discussed, fuel pressure, low injector pulsewidth, a radical timing change I believe could also induce this issue as would a vacuum leak. For this engine to quit it has to be losing...1 the correct amount of fuel...2 the correct amount of spark as well as at the correct time. Now thaty being said, Art has indicated that he's put a timing lite on it and all looks good, what the timing is doing just proir to stall may be unknown, say forsome strange reason the ECU decides to drastically retard the timing.... what happens, or say the ECU decides to decrease the coil dwell time what happens? The same can be said for the injector control if for some reason it decreases the pulsewidth what happens? Any of these things can cause the symptom he's got. As a starting point I would log injector pulse width... coil dwell time... ECU calculated Ign. timing, also the crank trigger wheel counts as well as the cam sync trigger if available. Another handy tool I use quite often is an inline spark checker as well as a "noid" lite. While carefully observing these during the event it can be apparent that the coil quits... then the engine stalls or you see the noid lite quit flashing then the engine stalls, this happens very quickly but with an engine that repeats the failure quite often it's easy to pick out. Have a problematic car now from another shop that just quits at times, by using my lab scope I noticed that at times the 18X crank signal gets erratic, gonna replace that and see if it's fixed. Wish I were close enough to go help ART first hand however I belkieve he's got the smarts to locate this issue.